I'm doing some work on my brothers Zero turn that has a hole in one rear tire. I found the hole yesterday and tried twice to plug it and both times it leaked. I've put a bunch of them in car tires and don't remember any failures. I always use tubes in my tires but I didn't have one the right size so I was going with the easy fix. I guess I'll get a tube for it but I've seen other people plug mower tires successfully. Anyone else had trouble doing this.